Materials Literature
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The isothermal galvanomagnetic behavior of an isotropic conductor in a magnetic field can be described by the vector equation E=ρ⊥j+n(j·n) (ρ∥−ρ⊥)+ρH(n×j),relating the electric field E to the current density j. The resistivities ρ∥ and ρ⊥ are those which result when the magnetic induction is parallel to j, and normal…
A discussion of the various physical processes relevant to the ionization of solid particles is given. Detailed considerations of the rates of thermionic and photoelectric emission from charged particles, electron attachment and recombination with charged particles and energy exchange in these processes are presented.…
The elastic moduli of pyrolytic graphite, a polycrystalline material exhibiting large elastic anisotropy, have been measured by the ultrasonic pulse-echo method. In units of 1011 dyn/cm2, they are c11 = 5.21, c12 = 1.88, c13 = 1.80, c33 = 2.58, and c44 = 0.15.
The viscosity of liquid water between −10° and +150°C (Psat=4.7 atm) is expressed by the equation: η=A exp[B/ (T−T0)], in which A = 290 μp, B = 510°, and T0 = 150°K. The true temperature-independent activation energy for viscous flow is E = RB = 1020 cal/mole. The ``free volume'' representation uses the equation η=A e…
The systems NixFe1−xCr2O4, CuxNi1−xCr2O4, and CuxCo1−xCr2O4 have been prepared and their crystallographic properties studied. From consideration of Jahn-Teller effects, it was shown that A-site Cu2+ is more effective than A-site Fe2+ in stabilizing a tetragonal (c/a<1) distortion at A-site Ni2+. In addition con…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA THERMODYNAMIC STUDY OF THE THORIUM—OXYGEN SYSTEM AT HIGH TEMPERATURES1R. J. Ackermann, E. G. Rauh, R. J. Thorn, and M. C. CannonCite this: J. Phys. Chem. 1963, 67, 4, 762–769Publication Date (Print):April 1, 1963Publication History Published online1 May 2002Published iniss…
The problem considered is the interpretation of the tensile properties of twisted continuous-filament yams in terms of their geometrical structure and the properties of the constituent filaments. The theory developed for this purpose has the following principal features. (1) It is a large-strain theory, (2) Constancy…
A theory of the high temperature lattice thermal conductivity of semiconducting alloys is described in which normal processes are taken into account by the use of Callaway's method. This theory is in good agreement with data on germanium-silicon alloys, published recently by Abeles et al. , but it is shown that the th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTridentate Chelate Compounds. IIIJohn F. Geldard and Francis LionsCite this: Inorg. Chem. 1963, 2, 2, 270–282Publication Date (Print):April 1, 1963Publication History Published online1 May 2002Published inissue 1 April 1963https://pubs.acs.org/doi/10.1021/ic50006a008https://…
The saturation magnetostrictive constants of a magnetic material may be determined by means of ordinary ferromagnetic resonance. For small strains, the magnetic field required for resonance at a given frequency is a linear function of the applied uniaxial stress. The magnitude of this shift may be directly related to…
A powder neutron diffraction study of stoichiometric NiS has been made in the range 85–770°K. The NiAs-type structure can be obtained at room temperature by quenching from above 700°K. This NiAs form exhibits a paramagnetic-antiferromagnetic transition at 263°K. In the antiferromagnetic state the moments in a hexagona…
Pleochroism of the infrared absorption of muscovite has been measured under moderate resolution. The results are discussed in terms of the idealized mica structure. From the pleochroism of the OH stretching band, orientation of the vibrational transition moments can be determined. These moments are tilted out of the c…
The magnetostriction of single-crystal yttrium iron garnet (YIG) has been measured from liquid nitrogen temperature to 450°K. The theory of magnetostriction of cubic crystals has also been extended to Néel ferrimagnets. The theoretical predictions of the temperature-dependent magnetostriction coefficients h1 and h2 ar…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTHE FREE ENERGY OF SiC FROM ITS SOLUBILITY IN Fe AND FROM GAS—SOLID EQUILIBRIA WITH SiO2, GRAPHITE, AND CORichard H. Rein and John ChipmanCite this: J. Phys. Chem. 1963, 67, 4, 839–841Publication Date (Print):April 1, 1963Publication History Published online1 May 2002Publish…
The direction of easy magnetization in pyrrhotite deviates from the (001) plane below 205°K. We have measured the thermal variations of the anisotropy constants and the spontaneous magnetization between 4.2° and 292°K and determined the fraction of Fe3+ ions on each sublattice.
A series of constant strain range tests was made for a wide variety of materials producing fatigue lives varying from a few cycles to about one million cycles. The specimens were subjected to axial, compression-tension, low-frequency fatigue about a zero mean strain. Load range was measured periodically throughout eac…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Reaction of Sodium Borohydride with Nickel Acetate in Ethanol Solution--A Highly Selective Nickel Hydrogenation CatalystHerbert C. Brown and Charles A. BrownCite this: J. Am. Chem. Soc. 1963, 85, 7, 1005–1006Publication Date (Print):April 1, 1963Publication History Publi…
Abstract The view that the glass transition is basically thermodynamic in nature is used to derive an expression for glass temperature depression by plasticizers. The second‐order transition temperature is given as that temperature at which the configurational entropy first becomes zero as we cool the polymer–diluent…
The results are given of comprehensive measurements on the magnetic and crystallographic properties of the ferromagnetic Heusler alloys Cu2MnAl, Cu2MnIn, Cu2MnSn, Cu2MnGe, Au2MnAl, and the antiferromagnetic alloy Cu2MnSb. The alloys Cu2MnBi and Cu2MnGa are polyphase and the ferromagnetism may be due to binary phases p…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSTABILIZATION OF WATER-IN-OIL EMULSIONS BY SOLID PARTICLES1E. H. Lucassen-Reynders and M. VAN DEN TempelCite this: J. Phys. Chem. 1963, 67, 4, 731–734Publication Date (Print):April 1, 1963Publication History Published online1 May 2002Published inissue 1 April 1963https://pub…